When removing moisture from a cable and it is determined that the moisture penetration is confined to the cable ends, a length not greater than ____ may be cut from each end and a new measurement of insulation resistance shall be made.

four feet

When dealing with damaged cables you should avoid ____ whenever possible

Splicing

The Coast Guard basically uses two types of connectors. They are?

· Multi-Pin connectors, and· RF connectors.

What are the 4 most commonly used types of RF connectors used in the CG?

UHF, N, C, BNC

Three types of multi-pin connectors used in the CG are?

Amphenol, Bendix, Cannon

All connectors that are not indoors must be weatherproofed. Electrical connectors shall be weatherproofed within ___ hours of assembly.

24

Weatherproofed multi-pin connectors should be visually inspected how often for signs of deterioration.

monthly

Waveguides are used to transmit frequencies in the ____ range.

microwave range (.9 GHz- 100 GHz).

Waveguides are basically hollow pipes that guide electromagnetic waves. They are made of conductive material. What are the three types of material?

brass, copper, or aluminum

Waveguides are found in what three shapes?

· Rectangular,· Circular, and· Elliptical.

What is the most common type of waveguide found?

rectangular

When coaxial cable is used as a microwave transmission line it has what kind of loss?

High Loss

Waveguide systems are pressurized to help prevent what?

· Foreign material from entering the waveguide, and· Moisture from accumulating in the waveguide due to temperature changes.

If desiccant is used to control moisture a blue color indicates what?

Dry condition, no action required

If desiccant is used to control moisture a pink color indicates what?

It has absorbed too much moisture and replace the dehydrator plug.

Pressure windows are also called what?

waveguide moisture barriers

A waveguide pressure system should not drop any more than ___ of the required pressure within a ____ hour period?

5%, 6 hours

Where should a purge valve be installed on a waveguide pressure system?

the lowest point in the system

A purge valve is used to do what in a waveguide pressure system?

· To remove excess moisture that the desiccant is unable to remove, and· When purging the system after the waveguide has been opened for repairs.

The most common trouble encountered with waveguides is?

The presence of dirt, moisture, and other foreign material.

Waveguides are required to have the warning label which says what, and painted every____?

What is the minimum separation required between an Active cable and a Passive cable?

18 inches

Given the following information, determine the power loss (in watts) of the cable.Power into cable: 50 wattsVoltage into cable: 100 voltsCable length: 352 ft.Cable loss: 2.3 db per 100 ft.

42.25 watts…

Total loss in db is .023 db per ft. X 352 ft. = -8.096 loss.

Applying the Power out formula 10 (db/ 10) x Pin = Pout gives a Pout of 7.751 watts. This results in a total loss of 42.25 watts(50 watts - 7.751 watts)

The minimum bend radius of a Semi-rigid cable with an outside diameter of .875” is ______.

10 inches

Cable tags shall be installed on one side/either side/both sides of bulkheads and decks.

both sides

What can be done to protect cables from sharp edges?

Install support clamps, synthetic tubing, or wrap cable with several layers of electrical tape.

When testing multi-conductor cables, the minimum resistance between individual conductors should be ____ohms.

Greater than 50 k ohms.

When routing a cable to a terminal board, how long should you leave spare conductors?

Long enough to reach the farthest terminal.

What is the maximum temperature that stored cables should be exposed to?

151 degrees Fahrenheit.

What must be done to a cable that has been exposed to moisture before you use it? (explain procedure)

Cut back the end of the cable that was exposed no more than four feet to determine if the insulation resistance increases. If it doesn’t increase, discard cable. If it does, run a current through the cable for a few hours to improve its resistance. Continue this process until cable meets the required resistance value.

The two basic types of connectors used by the Coast Guard are _____ and _____.

Multi-pin and RF connectors

In general, a connector can be left without weatherproofing for up to ____ hours.

24

List 4 types of RF connectors used in the Coast Guard.

UHF, N, C, BNC

The range of the Microwave frequency band is ______.

900 Mhz to 100 Ghz.

What key factor determines the size of a waveguide?

Wavelength

How much pressure (psi) are waveguide systems designed to hold?

3 to 5 psi

A localized area of discoloration in a waveguide indicates _______

The presence of a foreign object inside the waveguide. A.K.A. hot spot.

What are pressure windows?

A moisture barrier that allows a waveguide to be pressurized.

Box connectors are/are not classified as watertight.

not

What should you do if you tighten down the gland nut in a metal stuffing tube and the cable is still loose?

Add additional sealing packs around the cable.

State the procedure for replacing a rubber bushing on an existing nylon stuffing tube with a cable run.

Cut a 30 degree slit on the new rubber bushing and wrap around cable.

State the 2 types of bonding.

direct, indirect

What is bonding?

The process of joining metal objects together and producing a low impedance connection between them

The maximum resistance between two bonded metals should be ___________ .

Less than .001 ohm

After completing an installation, what other steps should be taken to insure your customer(s) are totally satisfied?

a. Clean up your mess

b. Document any work alterations and notify the issuing authority

c. Perform a complete functional check to ensure system works properly